Method for calculating neck load in pilot ejection process through ground simulation

Abstract

The invention discloses a method for calculating neck load in a pilot ejection process through ground simulation. The method comprises the following steps: measuring a pure aerodynamic lift value of a head wearing system under a corresponding ejection speed condition; performing inner ballistic performance calculation according to the inner ballistic physical model of the ejection power system to obtain an overload-stroke curve of the pilot seat in an ejection cabin-out stage; obtaining a speed-stroke curve of a head seat in a flow field in the ejection cabin-out stage under the corresponding ejection speed condition through simulation, and finding out the seat stroke under the condition that the airflow speed is maximum according to the speed-stroke curve; finding a seat overload value when the seat travel is s according to the overload-travel curve; adding the actually measured weight of the head wearing system to the head weight of the corresponding pilot to obtain the weight of the head system; and obtaining the maximum value of the neck load in the ejection process. The number of ejection tests with high cost is effectively reduced, the development effect is improved, and the test cost is reduced.

Description

technical field [0001] The invention relates to the technical field of aviation lifesaving, in particular to a method for ground simulation calculation of the neck load of a pilot during ejection. Background technique [0002] During the ejection process of the pilot's seat, due to the existence of high-speed airflow, the pilot's helmet has a large aerodynamic lift, and the aerodynamic lift acts on the pilot's neck to form a neck load. In order to ensure that the pilot's neck is not stretched during ejection, it is necessary that the neck load does not exceed the physiological limit. [0003] The existing way to obtain the neck load during the ejection process can only be obtained through the ejection test with speed, and the ejection test is limited by various factors such as the rocket block, the canopy, the rocket engine, and the ejection seat. The experiment requires at least 2 million yuan, which is not only costly, but also uncontrollable. Contents of the invention ...

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Problems solved by technology

[0003] The existing way to obtain the neck load during the ejection process can only be obtained through the ejection test with speed, and the ejection test is limited by various factors such as the rocket block, the canopy, the rocket engine, and the ejection seat. The experiment requires at least 2 million yuan, which is not only costly, but also the progress cannot be controlled

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